When Do You Not Need a Licensed Contractor in Washington?

The $500 casual-work exemption

RCW 18.27.090 exempts “any work or operation on one undertaking or project by one or more contracts, the aggregate contract price of which for labor and materials and all other items is less than five hundred dollars,” from the registration requirements. That is the rule most people have heard of. It is also the rule most often quoted out of context.

The statute attaches three conditions to the exemption, and all three have to hold.

It is not part of a larger job. The exemption does not apply where the work is only part of a larger or major operation, whether the same contractor does it or the work is split into contracts of less than $500 to avoid the chapter.
They are not advertising as a contractor. The exemption does not apply to a person who advertises or puts out a sign, card, or other device indicating to the public that they are a contractor or that they are qualified to engage in the business of contractor.
It is genuinely casual, minor, or inconsequential work. The statute calls the work “casual, minor, or inconsequential” in nature.

The $500 rule is a threshold, not a loophole. If a “handyman” quotes you $400 for the bathroom and $600 for the kitchen, the $600 work still requires registration. Splitting a project so each piece falls under $500 is specifically what the statute prohibits.

Working on your own property

RCW 18.27.090 also exempts any person working on their own property, whether or not they live there, and any person working on their personal residence, whether or not they own it. This exemption does not apply to someone performing contractor work on their own property for the purpose of selling, demolishing, or leasing the property.

An owner who contracts with a registered contractor is also exempt from the registration requirements, but the exemption does not strip the owner of the protections in the chapter against registered and unregistered contractors. In other words: hiring someone else does not put your project outside the bond and insurance rules, it puts you inside them.

Other exemptions worth knowing

Public utilities, public agencies, and their authorized representatives.
Work incidental to discovering or producing petroleum or gas, and drilling or mining operations.
Sale of finished products and materials that do not become part of a structure.
Construction, alteration, or repair of personal property, where you are the owner or legal owner, and work by a mobile or manufactured home retailer or manufacturer licensed under chapter 46.70 RCW.
Work on your own property by your own employees.
Licensed architects, civil and professional engineers working in their professional capacity, and certified electricians and plumbers working within the scope of their certification.
Employees of a registered contractor whose sole compensation is wages, and independent contractors operating as employees.

The part that is easy to get wrong

The exemptions cover registration. They do not necessarily mean nobody should check. If you are unsure whether a job falls under the exemption, ask L&I directly rather than relying on what the contractor tells you, and check the license number on the L&I verification tool before you pay a deposit.

Sources

Everything above comes from Washington state primary sources. These are the pages the requirements are written on, so you can read the actual language and check the figures yourself.